The paper “ Introduction to Combustion and Fire” is an informative example of a finance & accounting coursework. Power/Pressure)1/3Solution: Power = Watts/time = kgm2/s4, Pressure = Newton/meter2 = kg/ms2, (Power/Pressure) 1/32. Convert in the SI units the following values: a) 5cm/microsecondSolution: b) 0.36 x 10 - 10 tons km/min2Solution: 2. Chemical Elements and CompoundsTheoretical question1. What are free atoms and radicals? What is the difference between an ion, free atom, and radical? AnswerFree atoms are atoms whose properties like magnetic moment are not significantly affected by nearby atoms, molecules, or ions. Radicals on the other hand are atoms, ions, or molecules with an unpaired electron (an open shell configuration) which is highly reactive.
Radicals differ from ions since radicals do not possess a charge whereas ions carry either negative or positive charge. Exercise1. Explain chemical bonds in the molecule of methane. AnswerMethane CH4 has covalent bonding. A covalent bond is a type of chemical bonding characterized by the sharing of electrons between atoms. It is introduced by Lewis in the Lewis’ electron dot notation. The Carbon in Methane has 4 electrons covalently bond with the electrons of Hydrogen through attraction-to-repulsion stability to form methane molecules.
3. States of Matter: Fluids, Solids, and GasesExercise1. Calculate the vapor densities (kg/m3) of pure C5H12 at 25oC and 1 atm = 1.013 105 Pa. (Assume ideal gas behavior. )Solution: Atomic Mass of C = 12.014. Chemical Reactions and Their RatesTheoretical questions1. What are the stoichiometric, fuel-lean, and fuel-rich mixtures? Give an example. Answer: Stoichiometric mixture refers to the air-fuel ratio that usually occurs when fuels are combined with free oxygen and the mixture turns out to be chemically balanced. The stoichiometric air-to-fuel ratio is approximately 14.7 to 1.
A fuel-rich mixture occurs when the air-fuel ratio is below 14.7:1 and a fuel-lean mixture occurs when the air-fuel ratio is more than 14.7:1. Spark ignition engines are run by fuel-rich mixtures while compression-ignition engines are run by fuel-lean mixtures.